3 // Copyright (c) 2006-2007 Matias Capeletto
5 // Distributed under the Boost Software License, Version 1.0.
6 // (See accompanying file LICENSE_1_0.txt or copy at
7 // http://www.boost.org/LICENSE_1_0.txt)
9 /// \file tags/support/default_tagged.hpp
10 /// \brief Weak tagging
12 #ifndef BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP
13 #define BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP
15 #if defined(_MSC_VER) && (_MSC_VER>=1200)
19 #include <boost/config.hpp>
21 #include <boost/bimap/tags/tagged.hpp>
23 /** \struct boost::bimaps::tags::support::default_tagged
24 \brief Weak tagging metafunction
27 template< class Type, class Tag >
30 typedef {TaggedType} type;
34 If the type is not tagged, this metafunction returns a tagged type with the
35 default tag. If it is tagged, the returns the type unchanged.
37 See also tagged, overwrite_tagged.
40 #ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
49 // A metafunction that create a tagged type with a default tag value.
51 template< class Type, class DefaultTag >
54 typedef tagged<Type,DefaultTag> type;
57 template< class Type, class OldTag, class NewTag >
58 struct default_tagged< tagged< Type, OldTag >, NewTag >
60 typedef tagged<Type,OldTag> type;
63 } // namespace support
68 #endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
70 #endif // BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP